water tap vs water faucet

water tap and water faucet both are nouns.

Word	Noun	Adjective	Verb	Adverb
water tap	Yes	No	No	No
water faucet	Yes	No	No	No

As nouns, water tap and water faucet are synonyms defined as:

water tap and water faucet: a faucet for drawing water from a pipe or cask

Other synonyms of water tap include hydrant, tap.

water tap (noun)	water faucet (noun)
a faucet for drawing water from a pipe or cask	a faucet for drawing water from a pipe or cask